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In this exercise, we estimate the rate at which the total personal income is rising in a metropolitan area. In 1999, the population of this area was 987,200, and the population was increasing at roughly 9500 people per year. The average annual income was $31,775 per capita, and this average was increasing at about $1300 per year (a little above the national average of about $1225 yearly). Use the Product Rule and these figures to estimate the rate at which total personal income was rising in the area in 1999. (Round your answer to three decimal places.) $ X billion per year Enhanced Feedback Please try again. For finding the rate of change of total personal income, start by finding a function for total personal income by multiplying together two other functions. Then, differentiate the function using the product rule and plug in the given values. Need Help? Read It Watch It Submit Answer